Collapsible shelter



FIG. 1 is a front elevational view of a collapsible shelter, showing my new design;

FIG. 2 is a rear elevational view of the design of FIG. 1;

FIG. 3 is a side elevational view of the design;

FIG. 4 is a side elevational view of the opposite side of the design;

FIG. 5 is a top plan view of the design;

FIG. 6 is a bottom plan view of the design;

FIG. 7 is a perspective view of the design; and,

FIG. 8 is a perspective view thereof, showing the design in use, the broken line showing is for illustrative purposes only, and forms no part of the claimed design. 

The ornamental design for a collapsible shelter, as shown and described. 